Marco Mainspring #232P for Waltham Colonial Series Model B 17j No. 2237 - Alloy

Marco Mainspring No. 232P for Waltham Colonial Series (roughly a 12s) Model B 17j movements, Factory No. 2237, alloy, new in envelope. See image for further details and precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item